Megalobrachium Stimpson, 1858

Megalobrachium Stimpson, 1858: 228 . Porcellanides Nobili, 1901: 21 .

Porcellanopsis Rathbun, 1910: 601 . Pisonella Glassell, 1938: 436.

Type-species. Megalobrachium granuliferum Stimpson, 1858 [by original designation].

Key to species known from Brazil

1. Lateral margins of carapace with row of 3 or 4 teeth. Telson composed of 5 plates........................ M. soriatum

- Lateral margins of carapace with crenulate crest. Telson composed of 7 plates.................................... 2

2. Carapace rounded. Walking legs slender, propodus with 5 spines on flexor margin...................... M. mortenseni

- Carapace subtriangular. Walking legs robust, propodus with 2 spines on flexor margin...................... M. roseum